Abrading machine



Oct. 1.1, 1949. A l- PAULSQN` 2,484,583

ABRADING MACHINE Filed Nov. 27, 1945 4 Sheets-Sheet 1 lNvE R Oct. l1, 1949. A, J, PAULSON 2,484,583

ABRADING MACHINE Filed Nov. 27, 1945 4 Sheets-Sheet 2 INVEN Oct. l1, 1949. A. J. PAuLsoN ABRADING MACHINE Filed Nov. 27, 1945 4 She'es-Sheet 3 ATroRNEY Oct. 1l, 1949. A J, PAULSON 2,484,583

ABRADING MACHINE Filed Nov. 27, 1.945 l 4 snags-sheet 4 v .L51 Q O 24 5320 @25 0 24 O G/ ,23 25. l2 A Ii-7 a H65 H69 H5 /0 Hw/ a v 27 27, @j W gj H/a ,9g/9 30" H6 /5 Hwa H044 f7 37 36 35 ,25l l 5' H622 H623 H624 'ff/@25 H6126 f/ 2y 6 29 29 32 a Uff@ /f/l /6 f7/7 H520 H52/ l O l -l- 1 lll Il ,A

Patented Oct. 11, 1949 UNITED STATES TENT oFFlCE ABRADING MACHlNE Augustus J. Paulson, Trevose, Pa.

Application November 27, 1945, Serial No. 631,027

4 Claims.

My invention is an abrading machine which is primarily designed for grinding the faces of cutting or biting edges of teeth of power driven chain-saw links, such biting edges being preferably ground at acute angles to ground peripheral or trailing edges of such teeth. As such chain saws generally comprise sets of pivotally connected links having some of their teeth bent laterally with respect to the plane of the link body and hence with respect to the plane of the kerf, my improved machine is preferably adapted to receive and grind links having teeth bent at various angles, and to this end various types of Work-supporting seats may be substituted for one another in the machine.

By my improvements, the biting edges of such saw teeth may be ground accurately and rapidly by an abrasive face of a rotating cup wheel of substantially constant diameter, and the abrasive face of the grinding wheel may be frequently dressed without interrupting the production of ground links.

In the preferred embodiment of my invention, a rotatable abrasive wheel and a rotatable work holder are mounted to rotate about parallel axes and the wheel and holder are axially adjustable so as to bring a radial face (as distinguished from a peripheral face) of theabrasive wheel into engagement with the tooth of a link held by the Work holder.

The work holder preferably comprises a wheel or disk having peripheral sockets for receiving various types of seats on which various types of chain links may be held for grinding. Each of the various types of seats has a substantially radially extending surface with one or more Work locators projecting therefrom. A spring biased pressure clamp rocking on an axis substantially parallel with the axis of the work holder presses a work piece against such radial seat so as to hold the biting edge of the tooth to be cut substantially radially with respect to the axis of the work holder.

Preferably each clamp is spring biased to yieldingly hold a work piece against a radial seat during the grinding of the tooth, and is positively rocked away from the seat before and after the grinding of a tooth to permit the insertion and discharge of work pieces.

The positively acting clamp-rocking mechanism preferably comprises a series cf plungers normally biased away from the clamps and a complementary 4series of axially movable cams which are operated by the engagement thereof with a pair of xed cam members having spaced tapered ends` The rotatable work holder also carries a dressing tool, such as a diamond point, for dressing the abrading face of the grinding wheel on each revolution of the Work holder; the diamond point preferably lying at a greater distance than the work piece seats from the center of the tool holder.

The characteristic features and advantages of my improvements Will further appear from the following description of a preferred embodiment of my invention and the accompanying drawings in illustration thereof.

In the drawings, Fig. 1 is a top plan View of a grinding machine embodying my invention; Fig. 2 is a front elevation of the revolving work holder and its support taken on the line 2-2 of Fig. 1 butwith the grinding wheel omitted; Fig, 3 is an irregular sectional View of the Work holder and its stand taken on the line 3-3 of Fig. 2; Fig. 4 is a rear elevation of a stripped work holder wheel; Fig. 5 is a top plan View of the stripped work holder Wheel shown in Fig. 4; Fig. 6 is a face View and Fig. 7 is a side View `of a work piece seat; Fig. 8 is a plan view and Fig. 9 is an edge view of a work piece clamp; Fig. 10 is a plan view and Fig. 11 is an edge view of a clamp bracket; Fig. 12 is a detached detail view of a clamp biasing spring; Fig. 13 is an end View and Fig. 14 is a longitudinal View of a clamp-rocking plunger; Fig. 15 is a detached detail view of a coiled spring for biasing the plunger away from the clamp; Fig. 16 is an edge View and Fig. 17 is a plan View of a plunger guide ring and retainer; Fig 18 is an end View and Fig. 19 is a longitudinal view of a cam slide for operating the plunger; Fig. 20 is an edge view and Fig. 21 is a face view of a closure for the cam slideway; Fig. 22 is an end View and Fig. 23 is a longitudinal view of adressing tool; Fig. 24 is an end view and Fig. 25 is a longitudinal View of a dressing tool post; Fig. 26 is an end View and Fig. 27 is a longitudinal view of a pintle for hinging the work clamp on its bracket; Fig. 28 is a top plan view and Fig. 29 is an end View of a Work holding seat plate which to vthe plane of the 'face of the stanchion.l

may be substituted for the seat plate shown in Figs. 6 and 7; and Fig. 30 is a face view and Fig. 31 is an edge view of one type of chain-saw link, such vas are ground on my machine when the latter is equipped with plates such as shown in Figs. 6 and 7.

In the embodiment of my invention illustrated in the drawings, a bed plate l has slidably mounted thereon a housin-g 2 which is adjustable by means of a hand wheel 3 and screw 4 journalled in a. bearing 5. A cup shaped abrasive wheel 6 is xed on the end of a shaft 1 journalled in the housing 2 and rotated by a source of power, such as an electric lmotortinotshowni. Thegrinding. Wheel 5 is "thereby rotatable by tha-:shaft aboutit15 an axis parallel with the direction of movement of the housing.

A stanchion 8 projects upwardly from the bed 2 in laterally and longitudinally spaced relation# to the housing 2 and has journalledzfthereintfa shaft 9 which is connected through the flexible coupling I with the shaft Heofiaagear .b'ef-lmfofvrl. an electric motor or other source of power.l3.

The front face of the stanchion has xed thereto two diarnetricallyl disposed kcam members eachl comprising a4 curved'ib'ar Mor `Itv projecting from* the facev of the stanchion and having-a flat intermediate surface' andI beveledend surfaces Ma', Mb and" Mc,- l4d respectivelytapering down The end of the shaft. 9 projects forward from thenface 'of 'th'e'stanchion and has' bolted ith'eretoa Work `holder Which `is'rotatable "about anaxisl parallelL with;;ibutfoffs1et= from, the axis ofthe" grin-ding; wheel 6'for*advancingvvork pieces; s uehjA as"chain;sa\v-links A; oneatva timejinto"posittgmr for engagement" by 'th-e abrasive-face of 5the rim of such grinding Wheel.

'I'he'-work holderI preferablycomprisesa Wheel orrdisk'Vv l5 having aperiphery containingequiiL .fn distant recesses I 6 each having front'and' back Walls 'of A'unequalheight; Thelower frontwallof Z each recess has a flat Surface I [projeegstingfor-4 Ward therefrom Valongalinewintersectingjto,l the periphery of the Wheell'5'.1A-countersunklsocket1 l @projects radiallyinward from each of Athese 'flat surfaces 'I 'l and ,eachsocket`v l 8th`asts` limerv endj'A intersected by'v anN axially zextending; aperture; formingl a slid'eway 1| 9 .j j

Each -recess `l s forms-'an'axialLgroove adapted;

toreeeivev the footofan L.shaped seat'platm'such" as Etfor 2o L the seat plate-- appropriatev for 1 .the

work tobedone-being secured"`to;.the1 bottom of., the,w groove by-al screw. Theilongerlegpf the?i seat *pl-'ate extends radially; .relativelyl 4to the axisV ofjthe Wheel i'andethenutenedge of'"such 'radial leg'contains'a notch 12 l .org 21d 'with' aj beveledlbot., tomflorg: Worklocatorpins23or 23:5pro-1, ject normally"*from'tlieface 01"tlf1eu radial; leg ofi substantially' coincident with'a" radius of the;l workeholder. Y

A'lf racl ety 2'4 is screwedito 'cacl'ieilat"surface-l,l andfhas- Ya clampj 25 hinged thereto byjthe bolt" 25. "The-'clarnp25-is normally' biased bya spring4 26J toward vposi-tion forfclampihg 'amwork' piece A aga-insb the radial surfacef-of the' seati plate 2t` orf-22 2' Each socket l 8 contaizisA `a headed* plunger' 215 which-is normally biased*inwardly-"andrgaway 'ifromg` the adjacentclamp LZifby-a coiled-'spring f Z-Wbeam ing"againstV the guide Ifingeandstop)` 29 x'ed" inf the counterbore-of"the-socketl'8 Each# plonger 27 iisd movable '`longitudinally;I

ses

cam slide consisting of a notched cylindrical shaft 30 which is normally positioned to permit seating of the tapered head 21' of the plunger 21 in the notch 32' of the slide 30. One end of the aperture/I9 is closed by a disk 32 to prevent the ejection of the slide 3D.

The tapered noses of the slides 30 project from the rear face of the work holder wheel I into the planes of the cam segments I4 and Ill which are of sucient height to shift the notches 35' beyond the heads 2l' when the noses of the respective shafts 30 engage the respective fixed cams I4 and I4. Each cam I4 or I4' is engaged bythe same number of slidescatany time, and when-ua slide. 30 isascendinggan acclivity of one cam another slide 30 is descending the declivity ofethe other cam so as to maintain balance and avoid chattering and Vibration.

Aavariety of work seat plates similar to the plates ,ZDrand may be provided, each type of plate having a vertical face so inclined as to appropriately iposition'ta. type of link having its toothL bent laterally at a desired angle. Preferably allthe recesses i6 contain plates of the same type, at any one time, but, if desired, different type-plates maybe mounted in successive grooves l -z vto perm-it sequential' grindingmf the differenti typesV ofV linksrequired -for forming-a vchainvr section:

The worklholder wheel-ff l 5 fcontains# avl radial socket 3ft-in Which-is secured aftoolipost'ahav-v' ing-a' seat36-for adressing tool3l, which maybe l clampedin positionfby a-suitable -set screw.y

InJ the operation-of themachine; a feeder may be positionedV at the-left off-the `machine (Fig. l)

to lay'a' link, suchl as A; upon eachl seat'plate,

such as 2U with theaperturesin the/'link in reg-is tration -vvith'the locator pins 23.` The-link or Workl pieceis placed" on a` particular plate While theV clamp appurtenant to the:particularseatfbeingl flleds'opened by-itsplunger'Zl, dueI to the movementof vsuch plunger -by the engagementof its complementary=-slide'30 with a cam segment 'llLfl Thef'linkA is so positioned-by theA locator pins--23ff thatthefbeveled notch 2 I in f thev platewill F pro-- vide cleafrance-- for-the grinding iwheell when the work holder is turned clockwise intofposition fon cutting the edgef--aof the link.

A-s theloadedseat -2li-reaches theapexy offitsl rotation;- tli'e slide 30 slides down the' taperedsurface'ildb'ofthe cam Iltvand` thevslide 3-ismovedlongitudinallyY by the pressure of the-l plunger-ountilf-the notch v registers with` the lieaizlV, thereby permitting the vplunger 2l to"` v recede and the spring 26 to bias the clamp -25 into position'to ysecurely lock' the work piecey A against tlre'seat-plate- 2l);EV

A'sg-the work-piece `or linlrfA' passes the wheel*7 Githe'edge -aeis-accurately ground bythe-face of'thee-abrasive'wheel 6: After the-workpiece'A hasI passedv theY Wheel 6,' thei nose of the-slide-30L eng-ages r'the1 acclivity" I4c-^ of the camsegment7 Mjtherebygshifting the sha-ftc3 "longitudinally toiengage` the'normal periphery thereof with' the c' I plunger -21 andeshift'Jthe-latterlongitudinally' to' open' theclampZSL The--work piece-A then'falls",` clearx of `Vthe locatorI pins' 23"and' as theA rotation" of the wheel I5 continues, the work piece-fall`s frornithe -work'holderg f On' each revolutionY offthe," Work" holder l 5, the: dressing` tool 31 contacts the a'brasive'iaceofj the" wheel "6 and'iaccurately 'dresses it'without inter= feringyvith`r production; since ,wear of Jthev wheel` y 6 may be compensated for' bythef; adjusting against fthe-biasing-acuon-- ir-itsv spring zsrbyea- 751* screw-4:

Having described my invention, I claim:

1. An abrading machine comprising a rotatable abrasive Wheel in a rotatable work-holder positioned for moving Work-pieces into engagement with a face of said Wheel, said holder having a series of work-'locator pins each extending substantially normal to a radius from an axis of rotation of said work-holder, and a clamp fulcrumed on an axis substantially parallel with said axis of rotation, said clamp having a body the length of which is substantially equal to the distance between its axis and the face of a Workpiece on said holder, said body terminating in an end portion farthest from said axis With said end portion having a surface in a plane normal to the length of said body, said clamp being movable into position about said axis so that the length of the body and the length of said locator pins are substantially parallel and the end surface engages the Work-piece.

2. A Work holder for an abrading machine comprising a rotatable Wheel having a series of radia-lly extending seats for Work pieces, a clamp adjacent to each of `said seats and rocking on an axis parallel tothe axis of rotation of said Wheel, for holding a Work piece thereon, and means for rocking said clamps and comprising a set of plungers and a complementary set of shafts movable transversely to said plungers.

3. A Work holder` for an abrading machine comprising a rotatable Wheel having a series of radially extending seats for Work pieces, a rocking clamp adjacent to each of said seats for holding a work piece thereon, a spring biasing each clamp toward work holding position, and means for rocking said clamps away from Work holding position and including a series of plungers, a complementary series of cam shafts movable parallel with the axis of rotation of said holder, and a stationary cam engageable by said shafts to shift said shafts longitudinally.

4. An abrading machine comprising a rotatable abrasive wheel and a rotatable work holder positioned for moving Work pieces into engagement with a face of said Wheel, said wheel being mounted in a support on one side of said work holder and having a radial abrading surface axially movable toward work on said holder from the support side thereof, said holder having a series of peripheral Work clamps rocking on axes parallel with the axis of rotation of said holder and means for rocking said clamps including a ring segment having a radial faced cam spaced from the side of said work holder on the side thereof remote from said support and slides projecting laterally from said work holder and engaging a lateral face of said ring segment.

AUGUSTUS J. PAULSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 766,403 Vincke Aug. 2, 1904 773,612 Wallace et al Nov. 1, 1904 1,262,529 Lowe Apr. 9, 1918 1,365,696 King Jan. 18, 1921 1,422,749 Dameron July 11, 1922 1,614,492 Rhodes Jan. 18, 1927 1,651,382 Gardner et al Dec. 6, 1927 1,884,309 Shippy et al Oct. 25, 1932 1,974,696 Swanson Sep. 25, 1934 2,105,872 Warner Jan, 18, 1938 2,222,580 Bergfeldt Nov. 19, 1940 2,352,551 Kende et al June 27, 1944 FOREIGN PATENTS Number Country Date 376,321 Great Britain July 6, 1932 

